Omron Programmable Terminals NT31 NT31C User Manual

Page 127

5-2

Section

Connecting to the Host’s RS-422A/485 Port

116

PCs supporting direct connection to

the CPU Unit

PCs supporting connection through a

Serial Communication Board

---

CS1G-CPU42/43/44/45-E(V1)

(*1)

CS1H-CPU63/64/65/66/67-E(V1)

(*1)

*1 A CS1W-SCB41 Serial Communication Board is required.

Settings at the Host

Connecting to a CS1 Series Serial Communications Board
Serial Communications Board equipped with an RS-422A/485 port for CS1-se-
ries CPU Units:

CS1W-SCB41 (Port 2 is an RS-422A/485 port.)

Reference: Serial Communications Boards and Serial Communications Units with lot num-

ber 991220 (12/20/99) and later support the high-speed 1:N NT Link. Boards and
Units with earlier lot numbers cannot be used.

Setting the Front Switches

Port 1
RS-232C

Port 2
RS-422A/485

PORT1

ON TERM

4 WIRE

OFF

PORT2

(RS422/

RS485)

RDY
COMM1
COMM2

SCB41

Terminator Switch (TERM)

Set to ON (right side)

Wire Selection Switch (WIRE)

RS-422A: Set to 4 (right side) for 4-wire type.
RS-485: Set to 2 (left side) for 2-wire type.

CPU Allocation DM Area Settings
Setting is written from the Programming Device (a Programming Console or CX-
Programmer) directly into the allocation DM area (system setting area) of the
CPU. After the setting is written, it becomes effective by turning the power ON,
restarting the unit, restarting the communication port, or execution of the STUP
command.

In the following table, the relevant word addresses in the allocation DM area and
settings are shown.

Allocation DM area

Writing

Settings

Port 2

Writing

Value

Settings

DM32010

8200

NT link (1:N) mode

DM32011

000A

Communications baud rate (high-speed)

DM32016

000

j = The largest model number of the

connected PT (0 – 7)

For example, when connecting PTs with model numbers 3, 4, 5, and 6 to port 2,
set the value 8200 Hex to DM32010, 000A Hex to DM32011, and 0006 Hex to
DM32016.

With the memory link method, the connection can be made to a personal com-
puter and an FA computer with RS-422A.

When using the Memory
Link Method